Bear in mind that the primary source of these articles is WSJ. Their source is "according to a person with knowledge on the matter". That's... well that's just a specious source, really.
My personal "conspiracy" theory is that this is further FUD being spread by Wolvereness or his allies to fabricate ill-will against Mojang. In particular, since Wolvereness himself can be quoted as mentioned that "Mojang is becoming Microsoft" in his opinionated rants.
For those not in the know, Wolvereness was a contributor to the bukkit project, which was a enhanced replacement server software for Minecraft that allows plugins. After learning that Mojang owned the project, he threw a fit and filed false DMCA takedown of every single bukkit-derived project on the internet, which has basically tied them all up in a legal sense with their web hosts.